Once you have discovered the Philosophers' Stone combine it as shown in this list:
*** Spoiler - click to reveal ***Philosophers' Stone + Water = Beer
Philosophers' Stone + Metal = Gold
Philosophers' Stone + Egg = Dragon
Philosophers' Stone + Poison = Water
Philosophers' Stone + Grass = Flower
Philosophers' Stone + Ghost = Energy
Philosophers' Stone + Werewolf = Human
Philosophers' Stone + Vampire = Human
Philosophers' Stone + Alcoholic = Human
Philosophers' Stone + Corpse = Human
Philosophers' Stone + Wood = Tree
Philosophers' Stone + Human = Demigod
Philosophers' Stone + Zombie = Corpse
All achievements for 'Doodle God' unlock upon exiting the game after being earned.